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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c4c12aef3361f5dddc258dd2a3d0c4047b30381e915f1b736d1dcd81116a29' 
  AND token = 'bh4iMcCRCxgMNRkP8al9VMD830TrNLfHLA9BFS6z3dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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