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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287224594f31e698baa8195a2fd80affaeccf56aa7e437f910f9fa504f12eb43' 
  AND token = 'i2iW/v0Kz81LfA9OCCdPrHdCrYX1Ec20oNzJa8m9QCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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