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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885b862d086380586e770ba2778d63515c91aa1d669b5918e71c26b566eb2f53' 
  AND token = 'Bd2C/T4sQV3DjxaZpR3D+pXQ9daA9VXKJ3kaHo/T0Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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