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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440ee69269ac91602235639d90f8302ef8a8b84294d6dd00c959655470c50d3e' 
  AND token = 'y1nx4dgT2da0SwocCCkQiD30D0YSflEgMDqy4Yg1UIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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