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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41244e8ba26f702611d14ca4b65d4bf30f1593fd1f1a792350c3d6d73a0a6ff' 
  AND token = 'snTgbcdUPJ723/4jIDsI9t0aPJMAkh/G40nsiLW1Dfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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