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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fd60ea69b921e6c2dfe8d0b2830f8839b46dc145681d6890e5ae1c2e45c0de' 
  AND token = 'bikTMNW/njhh5xpT5xghJV86e3R02LDjQ4iJMLKBikc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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