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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1be445d021b59c1173afa973d0ea47c778f2a74026f769852b4ecb754cd21e9' 
  AND token = 'wa5ykrDjuFjRuxAxpRWssPq/ZTaUYZW9zYqS9Lsl3W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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