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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0110d2dc86960a6f170b075475064498df504d3a4afa8748c43bbb5ed59c6092' 
  AND token = 'p8pPugM7uFuNACpyqlBPm9YifdFBZy9ZIZW8+B7n0Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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