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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af5a09f14c5a676681ebea13b16def90e7751512050cd9eeca11174dba59b24' 
  AND token = 'ZCCI+YMGZi4QaQr6vn33qPhSN0sshU1ZhpVisxSkCcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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