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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01663fa7ecc49944b26596a51084fddc96f33d97a6766a65e038f29a4c0a237b' 
  AND token = '0oAgL6KSPBxfXP9tWj8JsRglKWsyOD1nZYDK8SJTN/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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