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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1bd889da94adf160b184d6a87f3ce22552644e900401156f1cd766ae8514fe' 
  AND token = 'u3V2dWGv5uGGOaA9TFG7Ei6TWptzn15gTyRhhFnqXVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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