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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7e888395c76ae607a4e4db64849e5364f2e7c8ed38fa437d8cc7fe78131465' 
  AND token = 'nC0G0h32C3tFuwe6dBaXTZF27l8kg65QOh+gIY2ecmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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