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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20855d9b02231217a325bb08ef0ef1b5cf9e0ad6e9ea8b8d60652e5c6e76d8ba' 
  AND token = 'i6M7/YHgt1fVL77D7ALN261eZ0ppWFn34nsewWblJ5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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