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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b355bd07a2deffe4acd0931f7032a98df78b589b44b67a4a95ccc8fa89cae7' 
  AND token = 'KiErwgKaJpKXe0I8aiIOTGfr20uloz/5rcEKN0IoG3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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