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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13dc8bf7c6cb90117b4cd519afb9785c9a07e5b6442f775adea5436c03a14a4b' 
  AND token = '1OrO3RgXT4H0B0wzcID8DLG3WSR4oJzei2E181R/ky4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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