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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2654073354b0bb0658c913f4b4d37f5cbf355905053710c1e4de817637e930' 
  AND token = '54oA8Jytzhfcv7hKMrGD7m1nBDBpgyGCBB7iSQm80sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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