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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a360f7aa6dccfe7cd7f6ec93d04535afb86f9dbb6516b99a58623c948a11923d' 
  AND token = 'CiEgjomxcs7WrW3TBYnkDV0Cu1lKA8tKtsLRjHtzREY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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