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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9d8535fc82262b5eff16280a9fa3a424331c6b2d181996cd8af3556710e3ed' 
  AND token = 'wvx0tmZOBJOxxeb7kfHwRRpoNinoYm3LlUOR6MsVGdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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