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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f29f22585140f6ce74685ccdadc9407fe7a5a241608d03dbc4b1523f31b024f' 
  AND token = 'rixzV+HNkiuB3Z+TSbA4SzXdCKv+CbrGODMico9fMKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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