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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b16c280f80bd1914a5639e8014ec87beb5c7181e7d2446ac9167a5623143d17' 
  AND token = 'rk9qqG305v0XyeIneLn+OHkhFT9XRPa3RgSy4ztuOD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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