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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797868032dbb877a93428ba43a668a313c7db5ddf4a9bcb6f548d2d2d264e673' 
  AND token = 'sueNf3ynufNWx/MqMYI6POrb1XkBS/7TME1Ah68SNQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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