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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132aeb164447b3401fa9c43a8c794590c56750057276bc9faf84b7d3bf07c375' 
  AND token = 'rGAxQw+c902NA6rG0E+VfTGqNHBGdKKVxlPuoK5oOLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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