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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd992846b2d615fe6ad5e1e35fd6f1a49fa4b0e9457bf40c70d9396ac6472b6e7' 
  AND token = 'BwG/Gnwr/qng27z38j7gC6OwrnF9jrgCZr6kcoAGX7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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