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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff58e491d95f29d48bee747457c75bca22bc3584074cf9752db0e456ffa75b93' 
  AND token = '+MSnUq96e8xAKI6YqM1SSXWMJr7Er43yXreRS4dcOpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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