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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e153b837130dbc59c4682b48ce99ffd1a692a2682be4c169f67bdcdb2adf01' 
  AND token = 'pxiQBaef1PnH9Qfgo7kmeHlwbtpMLPf+gYxK+BxSTXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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