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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b6f1bb493bc7cecd97af7bd1a41d3b1f019b0d17ba7c5450c040654e019219' 
  AND token = 'Bxl9U1it60EvvR8H/ernLeVAGhQOhGWOHwWYyW5HyCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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