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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d37d3bfc79778e90f8c36179f7d65fc9177603a8634e2e199030a95b1b0ce2a' 
  AND token = 'aLSZbGcaaYvN67tST2Wo9QyvWFLKu8WbgnP4S/yMqBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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