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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a126c96e1ba68993e782e3c4daea9e6cab2c077b3290e17f67b29f59757e86' 
  AND token = 'cqC9TOIwoKjy1bCr86uO04Rjz414kLzm/ITN3cwT5jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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