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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8956ee35be27bcd727d0a653b462893426303aca8a35c01fef8d4423ee349a' 
  AND token = 'wtqL9O5DXH7wCMefrj8ksDzPZnWkspbuLAKNUT2BwqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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