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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10efb63a83cbedf8beb55864fad873c7718e464c7fec01a9d16fc6f44ead2b05' 
  AND token = 'w8TukuUux2/PWua0FnudqRJPrbdWN8TRPy9OsxH27/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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