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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113eaaa5762112d37bcce2814a3ed8d9f88f6ff633bbf01bf8063c5bfaa3d811' 
  AND token = 'pKbHo/vaHwfJdom0wSewC9L3yJYO6XBtd5/xZ4beijc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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