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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a523b7fa25297c9270e65d1dff7f1949fe699f97e6ce7264e7a95c4e1dab8474' 
  AND token = 'YlwGu7S1cCEbZmgA0aniNW9nqBwUojYH9O0jnlBeUQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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