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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa7331cc3987b6b5d8af175c03838abb206b5d9392b5a0868cb3832df475a23' 
  AND token = '/mxCliaGQB5fGFlOMoLZyW8CJxGgT2TDb2GlJY9U5l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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