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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6711dfa2e1e1967e1a84cbbc1ebdcd926c106c4f9a548904213557148dab9a4' 
  AND token = 'Wx+okVbeCiGk7mMHwj1xssgvcw5IbrFsI6pjUPk0cWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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