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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113a822520c3eef46bfe3ea813eb32bb6ff80e39e2c9aad68d1dc329eba99471' 
  AND token = 'ftcx2iU01EMPF3WABgviP6R/5oMQB7VEr9+VYZcHVbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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