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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354b2a118a481fb412b52bc022f69460400b883303a45faf479cacc98e8b3b6f' 
  AND token = 'dy5j7K9B4p3U5B7acvidNqFzE+GjiXCyy5LaPjyGNlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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