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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a618e53c6da5946609bec986fe5119f55501e0792d9f1b8a947fbe116911eb' 
  AND token = 'BOC6bTUiOFcXBD71qvBCVwF5zyXQRZ26T3oT7gTXkuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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