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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5eb140a7f24c4360a024c9181c48a01f4d6385b36c4d696a037ed084f75be8c' 
  AND token = 'r0N8lc5m+pgGQ41TO9N/srhoOLN1bM946zcheV6TbaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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