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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac30e8d5f2925d37ba54071fa3e8a8c2cfe42f106fa8bf095d44fb2bb89768c2' 
  AND token = 'XZltWyCn2rgF5wgdf/tF+H4QAhKIYP1TdBdOEIOo9bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}