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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3967f977e0534fcbcf54c9593ab2ab93d2f6bff4b579924aafe22b9f7fce40' 
  AND token = '+8iQZgWsN9v9EK+kx0rhqRNxn2GVrK/IuY/hvb9jyn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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