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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e8a0e942c6b4599e909c8a6b06f6ae055737a0a4791ef1beabc2c5bd5dcb9f' 
  AND token = 'ZumIIli8LFFu0EQXyDCnD2Dqtz54JswmNpYPoBUdzKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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