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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8596a4ac69c49856eb33f44b1a00a98a30170bd530b3b5f55f7299ca0d7e5039' 
  AND token = 'bWQPlMJa8QOnRnR5Q24vmRj/imib3bSYvTKc50Ek8rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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