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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873bd51bab20766dab90f1d554adb3cac03f67a24bc6990dde410066a51295bd' 
  AND token = 'yQ13i00kCKnN28nYx7WQflHfzjHfGsZoFVHqlc/7tig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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