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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee6bd4f4f40bdd6d4a3832a731ad03c19f31b5c8f318754299a43bdf4f5abab' 
  AND token = 'qyYiiQNCBy4CAUxVh9CfjgKimLdShVU7yU+gc2lzcaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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