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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ff3f520b851131d85749c98cf86adc68143f37e98074ff36ef9bb68695367d' 
  AND token = '2yQNvdbApvMBP3I5NgV2aZYKiHPLBymc2yJZKEsMVdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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