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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c4a9d12144cab83d55df8f2425bd31a0004d5dcee1a538d69038b7194ee108' 
  AND token = 'glN7fqmwJo8+vBQQwuxrxV1oibE93dDkbnbFyg9AlIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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