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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934b4ce93b993e8c1e8ac75cd7757afb9298af19c011660d30fc4502cd4a0e70' 
  AND token = 'aZDrtOovrB7Z/PgdNmQLkeJyQv7d4Fb7N/xMOxJStDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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