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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bda35dbc4e0d65d17e9ba9e158dcec120efa933d9a2313fb1d99a2d333f4019' 
  AND token = '8+jaUZ57TuNKvUtuMb3AZiY27FMKo4fI4wA2yMpC1b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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