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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ead5beff3e7f2588d22faf744e38d04d6fb7135c3cdfbbcb37d5991d6db9b0b' 
  AND token = '40xXpQ4L19buv1HmnTIjroM+0iwsgB08swZ4eESlD8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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