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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acc13a4423736d3a965a4a8f80580f953fbea7d4b67149e4701d72e475308cd' 
  AND token = 'ylflnS+4znOEv8qRtLMhWpOBhu2079I0J6BSviiRn7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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