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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8665edff9e8e6257e8543b832d6e3a2a8e9908c88551cc2d6297ce9104aa9be5' 
  AND token = 'Tm0Z6cEMoRuDgqjqPVYH4GmSmx3U4eAS1ZyPb9R/3gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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