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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5009a77adb5099d199c9af55284398d33a95fe9494a00dd105220c3bafc7ec8d' 
  AND token = 'fg8we15vzLl+41PjVcXEbhwhrqur4uHyR/muuF0gw4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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