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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb0b26c9bf49e54aea5ac877957f65e9c9cb9958ef03c64202de539bc02c34a' 
  AND token = '6Cq6gNz7MYdZS3y9DAP7AQVGjUMDWjD7OhPvCA84x54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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