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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d8fa9a00e20cf32f91f7fd5b7dbf4a1fe89e63336b217aee1f26ba5abd3154' 
  AND token = 'QMzz9/yYctwLsiL69jasgAIUS1kXB9479LBRVjyhloY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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