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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fbb2545777e546687a9a48d123c77975795f441d4491ec6c5e04a85cb65f7c' 
  AND token = 'kGmyiL0p+juLdq4nhQMUpvxQdwcuO7PU2b5epqCdoRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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