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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1363ed9104fe589fc01bfb4aaae2c9df5bfa053602db3a1fe180b2598c9ea2b4' 
  AND token = '3zR3HNHz3waY6pIlnKptUWGdvJs12VTfwqUo1fmZWPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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