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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6da33490dda6e40e8ddae105ae17454459c7445ad9e3f3060cdcbc6eaa53f57' 
  AND token = 'P86CiPfNnAaT83aKI2QrUFgJYFOqNciu9fTW8QBt3D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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