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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4b6ea0b8b2d9d37af0f5d95455c19f4abafd3f5391b58b88c33b091aff855c' 
  AND token = 'lPQxV7YAUTNpYXJcxWbpDGeMYCitI7ND5iymvBHUK5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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